Biosignal amplifier for the USBDUX-sigma

The amplifier operates at a gain of either G=500 (preferred) or G=2000. If you have an
EEG of approx 100uV you'll get 50mVp-p or 200mVp-p at the A/D
converter. This means that especially for G=500 there is enough headroom to
accommodate baseline shifts due to cable movements and DC drift while at the same time the 24 bit resolution
of the USB-DUX-sigma guarantees that the signal is still digitised at high preceision. At this gain
also single channel ECGs can be measured, for example Einthoven II.

eeg-1.0.zip
contains the EAGLE files and the
BOM. The PCB but it can be ordered from
Beta Layout by sending them the
.brd file. They can also fit the components. All components can be ordered from Farnell. Simply
copy and paste the BOM into their "quick paste" order form.